Start implementation of a pretty-printer for AST nodes.

	Start implementation of a pretty-printer for AST nodes.
	* dump.hh (dump_tree): New method for printing a node from the AST.
	* dump.cc (dumper::visit_field_ref): Remove const qualifier from
	model_field * parameter
	(dumper::visit_field): New method.
	(dumper::visit_method_invocation): Remove const qualifier for METH.
	(dumper::visit_forwarding_type): Remove const qualifier for
	model_type * parameter.
	(dumper::visit_forwarding_resolved): New method.
	(dumper::visit_forwarding_owned): Likewise.
	(dumper::visit_forwarding_simple): Likewise.
	(dumper::visit_forwarding_array): Likewise.
	(dumper::visit_forwarding_element): Likewise.
	(dumper::visit_forwarding_full): Likewise.
	(dumper::visit_forwarding_inner): Likewise.
	(dumper::visit_forwarding_parameterized): Likewise.
	(pretty_printer): New class for pretty-printing AST nodes.
	(dump_tree): Implement.
	* visitor.hh (visitor::visit_field_ref): Remove const qualifier from
	model_field * parameter
	(visitor::visit_field): New method.
	(visitor::visit_method_invocation): Remove const qualifier for METH.
	(visitor::visit_forwarding_type): Remove const qualifier for
	model_type * parameter.
	(visitor::visit_forwarding_resolved): New method.
	(visitor::visit_forwarding_owned): Likewise.
	(visitor::visit_forwarding_simple): Likewise.
	(visitor::visit_forwarding_array): Likewise.
	(visitor::visit_forwarding_element): Likewise.
	(visitor::visit_forwarding_full): Likewise.
	(visitor::visit_forwarding_inner): Likewise.
	(visitor::visit_forwarding_parameterized): Likewise.
	* model/fwdtype.hh (model_forwarding_resolved::visit): New method.
	(model_forwarding_owned::visit): Likewise.
	(model_forwarding_simple::visit): Likewise.
	(model_forwarding_array::visit): Likewise.
	(model_forwarding_element::visit): Likewise.
	(model_forwarding_full::visit): Likewise.
	(model_forwarding_inner::visit): Likewise.
	(model_forwarding_parameterized::visit): Likewise.
	* model/fwdtype.cc (model_forwarding::resolved::visit): Implement.
	(model_forwarding_owned::visit): Likewise.
	(model_forwarding_simple::visit): Likewise.
	(model_forwarding_array::visit): Likewise.
	(model_forwarding_element::visit): Likewise.
	(model_forwarding_full::visit): Likewise.
	(model_forwarding_inner::visit): Likewise.
	(model_forwarding_parameterized::visit): Likewise.
	* model/field.hh (model_field::visit): New method.
	* model/field.cc (model_field::visit): Implement.
	* fold.cc (fold_visitor): Adjust for visitor changes.
	* defassign.cc (definite_assignment_visitor): Likewise.
	* bytecode/generate.hh (bytecode_generator): Likewise.
	* bytecode/generate.cc (bytecode_generator): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcjx-branch@105132 138bc75d-0d04-0410-961f-82ee72b054a4